At this stage, after months of development, Mozilla developers are clearly nearing the end of this development marathon."
After Firefox beta 9, a beta 10 and a single RC are scheduled (this road map can change, of course). The main features of Firefox beta 9 are IndexedDB ( http://www.w3.org/TR/IndexedDB/ ) and tabs on titlebar (just like Chrome and Opera). IndexedDB allows sites to store data on your computer (prior your authorization). Tabs on titlebar is self-explanatory. Old-schoolers can always turn on the "show menu bar" to get their familiar GUI back.
Oh, and Fx beta 9 is fast and starts fast.
Firefox beta 9 available here: http://www.mozilla.com/en-US/firefox/beta/ and in lots of official mirrors.